Poll: Be careful what you wish for, lest it ____ true.
Be careful what you wish for, lest it ____ true.
it is true to use ''lest it should come true.
Lest is followed by the subjunctive tense. It means 'in order that ...should (not) + verb. So it should, in this case be 'come true'. The negative is built into the word 'lest' so another negative should not be used in the same expression (lest it negate the original meaning).
it must be.......................comes